Stator module and magnetic field generating structure thereof

ABSTRACT

The disclosure provides a stator module and a magnetic field generating structure which includes a magnetizer and an electrically conducting pipe. The electrically conducting pipe is wound around the magnetizer and has a passage inside. The passage has an outlet and an inlet opposite to each other. The electrically conducting pipe has a current input portion and a current output portion.

CROSS-REFERENCE TO RELATED APPLICATIONS

This patent application is a divisional patent application of U.S.patent application Ser. No. 13/846,124 filed on Mar. 18, 2013 andentitled “STATOR MODULE AND MAGNETIC FIELD GENERATING STRUCTURETHEREOF”, which is a non-provisional application claims priority under35 U.S.C. §119(a) on Patent Application No(s). 101143580 filed inTaiwan, R.O.C. on Nov. 21, 2012, the entire contents of which are herebyincorporated by reference.

TECHNICAL FIELD

The disclosure relates to a stator module and a magnetic fieldgenerating structure thereof.

BACKGROUND

With the development of technologies, a servo motor plays an importantrole in both the conventional industries and the high-end technologyindustries. It is also an inevitable trend to fabricate the servo motorwith a smaller volume, greater power and a lower cost. Currently, a hightorque servo motor is more and more widely applied in a processingapparatus, and thus the demands for the high torque servo motor areincreased. The most outstanding advantage of the high torque servo motoris that it does not need a decelerator to increase the torque output,thereby saving the cost of disposing the decelerator and reducing thevolume of the apparatus.

The output torque of the motor is closely associated with the inputcurrent, and larger current needs to be input in order to output ahigher torque. However, when large current is input into the motor, theheat dissipation problem needs to be considered. When the input currentis increased, the heat generated by the motor winding is also increasedaccordingly, and thus the temperature of the motor is significantlyincreased. If the motor is installed on the processing apparatus, thetemperature of the motor may affect the workpiece and cause thermaldeformation of the workpiece. Therefore, a heat dissipation system isfurther added to the motor system and is adapted for controlling thetemperature of the motor.

Currently, the heat dissipation system adopted by the servo motor is anexternally connected cooling water passage, and the heat, generated bythe motor, is removed by a cooling fluid in the cooling water passage.However, in the above heat dissipation manner, only after thetemperature inside the motor rises, the heat generated by the motor istransferred to the cooling water passage through the thermal conduction,of the material, of the motor, and is then dissipated by the coolingfluid. Furthermore, in the current heat dissipation manner, the coolingfluid can only dissipate a large amount of heat after a temperaturedifference between the motor and the cooling water passage reaches acertain level. Therefore, if the temperature inside the motor risesdramatically, the cooling water passage cannot dissipate the heat,through heat transfer, in time, so that the temperature inside the motoris rather high and exceeds what can be endured by the material of themotor, thus causing damages to the motor.

SUMMARY

An embodiment of the disclosure provides a magnetic field generatingstructure which comprises a magnetizer and an electrically conductingpipe. The electrically conducting pipe is wound around the magnetizerand has a passage inside. The passage has an outlet and an inletopposite to each other. The electrically conducting pipe has a currentinput portion and a current output portion.

Another embodiment of the disclosure provides a stator module. Thestator module comprises a magnetizer and a plurality of electricallyconducting pipes. The magnetizer comprises a base and a plurality ofteeth protruding from one side of the base. The plurality ofelectrically conducting pipes are respectively wound around theplurality of teeth. Each of the plurality of electrically conductingpipes has a passage inside. The passage has an outlet and an inlet. Eachof the plurality of electrically conducting pipes has a current inputportion and a current output portion.

Still another embodiment of the disclosure provides a stator module. Thestator module comprises a magnetizer, a plurality of electricallyconducting pipes, a cooling system and a power supply system. Themagnetizer comprises a base and a plurality of teeth protruding from oneside of the base. The plurality of electrically conducting pipes arerespectively wound around the plurality of teeth. Each of the pluralityof electrically conducting pipes has a passage inside. The passage hasan outlet and an inlet. Each of the plurality of electrically conductingpipes includes a current input portion and a current output portion. Thecurrent input portion and the current output portion are respectivelydisposed at two opposite ends of each of the plurality of electricallyconducting pipes. The cooling system is connected to the plurality ofoutlets and the plurality of inlets. The power supply system iselectrically connected to the current input portions and the currentoutput portions of the electrically conducting pipes.

BRIEF DESCRIPTION OF THE DRAWINGS

The disclosure will become more fully understood from the detaileddescription given herein below for illustration only, and thus does notlimit the disclosure, and wherein:

FIG. 1 is a schematic perspective view of a stator module according toan embodiment of the disclosure;

FIG. 2 is a schematic exploded view of the stator module according to anembodiment of the disclosure;

FIG. 3 is a schematic exploded view of a single magnetic fieldgenerating structure of the stator module according to an embodiment ofthe disclosure; and

FIG. 4 is a schematic structural view of a single magnetic fieldgenerating structure of a stator module according to another embodimentof the disclosure.

DETAILED DESCRIPTION

Please refer to FIGS. 1 to 3, FIG. 1 is a schematic perspective view ofa stator module according to an embodiment of the disclosure, FIG. 2 isa schematic exploded view of the stator module according to anembodiment of the disclosure, and FIG. 3 is a schematic structural viewof a single magnetic field generating structure of the stator moduleaccording to an embodiment of the disclosure.

The stator module 10 having a cooling function of the disclosure is, forexample, applicable to a servo motor. The stator module 10 comprises amagnetizer 11, a plurality of electrically conducting pipes 12, twofluid pipelines 13 a and 13 b, a cooling system 14 and a power supplysystem 15.

The magnetizer 11 is, for example, made of a silicon steel material. Themagnetizer 11 comprises a base 111 and a plurality of teeth 112protruding from one side of the base 111. Typically, the base 111 issubstantially annular, and has an annular inner surface 1111 inside. Theplurality of teeth 112 protrude from the annular inner surface 1111, andare arranged annularly about a central axis A.

Furthermore, in this embodiment, the plurality of teeth 112 aredetachably mounted on the base 111 in a combined manner. For example,each of the plurality of tooth 112 has a retaining block 1120, the base111 has a plurality of retaining groove 1110. The plurality of retainingblocks 1120 of the plurality of teeth 112 are assembled to the pluralityof retaining grooves 1110 of the base 111 to implement the combination.The disclosure is not limited to the above assembly manner. In this andsome other embodiments, the base 111 is assembled by a plurality of baseunits through the above combined manner.

The electrically conducting pipes 12 are, for example, made of a coppermaterial. The electrically conducting pipes 12 are respectively woundaround the plurality of corresponding teeth 112. Typically, oneelectrically conducting pipe 12 is wound around each of the plurality ofteeth 112. Each of the plurality of electrically conducting pipes 12 ishollow and has a passage 121 inside. The passage 121 has an outlet 1212and an inlet 1211 opposite to each other, and allows a cooling fluid topass through, so that the cooling fluid enters and exits thecorresponding electrically conducting pipe 12 through the outlet 1212and the inlet 1211, so as to dissipate the heat from the plurality ofelectrically conducting pipes 12. Two opposite ends of each of theplurality of electrically conducting pipes 12 has a current inputportion 1201 and a current output portion 1202, respectively. Thecurrent input portion 1201 and the current output portion 1202 areelectrically connected to the power supply system 15. The power supplysystem 15 provides a current to enter and exit the electricallyconducting pipe 12 through the current input portion 1201 and thecurrent output portion 1202, so that the current flows along theelectrically conducting pipe 12 to generate a magnetic field at thetooth 112. In this and some other embodiments, the combination of thesingle tooth 112 of the magnetizer 11 and the single electricallyconducting pipe 12 is regarded as a base unit of the magnetic fieldgenerating structure of the stator module 10.

Take the single tooth 112 for example, since the tooth 112 is mounted onthe base 111 in a combined manner, in this and some other embodiments,the electrically conducting pipe 12 is first wound around the tooth 112,and then the tooth 112 is mounted on the base 111, thereby facilitatingthe assembly of the stator module 10.

In this embodiment, in order to clearly demonstrate the characteristicsof this embodiment, the power supply system 15 is only electricallyconnected to one of the plurality electrically conducting pipes 12 forsimplicity of the drawings. However, in practice, the power supplysystem 15 is electrically connected to all the plurality of electricallyconducting pipes 12, the plurality of electrically conducting pipes 12are electrically connected to each other in parallel, or the pluralityof electrically conducting pipes 12 are divided into a plurality ofelectrically conducting pipe groups which are electrically connected toeach other in parallel, and each of the plurality of electricallyconducting pipe groups comprises the plurality of electricallyconducting pipes 12 which are electrically connected to each other inseries. Typically, the electrical connection modes (parallel connectionand serial connection) between the plurality of electrically conductingpipes 12 are not limited in the disclosure and those skilled in the artmay adjust the electrical connection modes according to actualrequirements.

In this and some other embodiments, the electrically conducting pipe 12is wound around the tooth 112 for one or more times. In this embodiment,the electrically conducting pipe 12 is, for example, wound around thetooth 112 for four times. Those skilled in the art can flexibly adjustthe number of times the electrically conducting pipe 12 is wound aroundthe tooth 112, according to the required intensity of the magneticfield.

In this and some other embodiments, the two fluid pipelines 13 a and 13b are annular. The fluid pipeline 13 a has a plurality of branchpipelines 131 a and three connection pipelines 132 a. The other fluidpipeline 13 b has a plurality of branch pipelines 131 b and threeconnection pipelines 132 b. The plurality of branch pipelines 131 a ofthe fluid pipeline 13 a are connected to the outlet 1212 of each of theplurality of electrically conducting pipes 12, and the plurality ofbranch pipelines 131 b of the fluid pipeline 13 b are connected to theinlet 1211 of each of the plurality of electrically conducting pipes 12.Both the plurality of connection pipelines 132 a of the fluid pipeline13 a and the plurality of connection pipelines 132 b of the fluidpipeline 13 b are connected to the cooling system 14, and the coolingsystem 14 provides the cooling fluid, so that the cooling fluid flowsinto the passage 121 of each of the plurality of electrically conductingpipes 12, through the fluid pipeline 13 b, in order to absorb heat.Then, the cooling fluid flows out of the passage 121, in each of theplurality of electrically conducting pipes 12, into the fluid pipeline13 a for gathering, and flows back to the cooling system 14. Therefore,a single cooling circulation is complete.

Typically, the plurality of passages 121 in the plurality ofelectrically conducting pipes 12 become water passages, connected inparallel, through the fluid pipelines 13 a and 13 b. Therefore, it isensured that the cooling fluid flowing through any electricallyconducting pipe 12 directly flows back to the cooling system 14 forcooling, which prevents the cooling fluid before being cooled fromflowing into the other electrically conducting pipes 12 anew to cause anundesirable heat dissipation effect.

In this embodiment, the one fluid pipeline 13 a and the one fluidpipeline 13 b are provided as an example for description, and the singlefluid pipeline 13 a and the single fluid pipeline 13 b are disposed tosimplify the design of the water passages, but the number of the fluidpipelines is not limited to the disclosure. For example, in otherembodiments, the stator module 10 comprises a plurality of fluidpipelines 13 a and a plurality of fluid pipelines 13 b, the plurality offluid pipelines 13 a are uniformly distributed and connected to theoutlets 1212, and the plurality of fluid pipelines 13 b are uniformlydistributed and connected to the inlets 1211. The above design can stillachieve the efficacy of the disclosure.

To ensure the assembly of the stator module 10, in this and some otherembodiments, the stator module 10 further comprises a plurality ofinsulating pipes 16. Each of the plurality of insulating pipes 16 isconnected between one of the two fluid pipelines 13 a and 13 b as wellas one of the plurality of electrically conducting pipes 12.Furthermore, the outlet 1212 and the inlet 1211 of each of the pluralityof electrically conducting pipes 12 are respectively connected to thebranch pipeline 131 a of the fluid pipeline 13 a and the branch pipeline131 b of the fluid pipeline 13 b through the insulating pipe 16.Therefore, the electrically conducting pipe 12 is electrically insulatedfrom the fluid pipelines 13 a and 13 b, so as to prevent the current onthe electrically conducting pipe 12 from being conducted to the twofluid pipelines 13 a and 13 b to cause leakage.

In this and some other embodiments, the cooling fluid provided by thecooling system 14 is a non-conducting fluid, for example, pure water,oil or air. Since the cooling fluid is nonconductor, the current on theelectrically conducting pipe 12 is prevented from being conductedthrough the cooling fluid to the fluid pipelines 13 a and 13 b to causeleakage.

In other embodiments, when the selected cooling fluid is conducting, aninsulating layer is coated on an inner surface of the passage 121, inorder to prevent the current on the plurality of electrically conductingpipes 12 from being conducted to the cooling fluid to cause leakage.

In the stator module of this embodiment, a current is allowed to passthrough the plurality of electrically conducting pipes 12 to generate amagnetic field, so that the plurality of electrically conducting pipes12 can be taken as common motor coils. In addition, the plurality ofelectrically conducting pipes 12 are hollow and allow the cooling fluidto pass through, so that the heat generated by the current when passingthrough the plurality of electrically conducting pipes 12 can be removedin time. Therefore, the heat dissipation efficiency of the stator module10 is improved.

Please refer to FIG. 4, which is a schematic structural view of a singlemagnetic field generating structure of a stator module according toanother embodiment of the disclosure.

This embodiment is similar to that in FIG. 3, and merely the differencesare described hereinafter. In this and some other embodiments, a thermalconductive adhesive 17 is disposed between the tooth 112 and theelectrically conducting pipe 12. The thermal conductive adhesive 17 isadhered to and is in thermal contact with the tooth 112 and theelectrically conducting pipe 12, so as to tightly fix the electricallyconducting pipe 12 to the tooth 112, thereby improving the thermalconduction effect between the tooth 112 and the electrically conductingpipe 12 as well as enhancing the overall heat dissipation efficiency ofthe stator module 10.

According to the stator module having the cooling function and themagnetic field generating structure thereof provided by the aboveembodiments of the disclosure, the electrically conducting pipe ishollow, so that a current is allowed to pass through the electricallyconducting pipe to generate a magnetic field, and a cooling fluid isalso allowed to pass through the electrically conducting pipe to removethe heat caused by the current in time. Therefore, the overall heatdissipation efficiency of the stator module and the magnetic fieldgenerating structure thereof are improved.

What is claimed is:
 1. A magnetic field generating structure,comprising: a magnetizer; and an electrically conducting pipe woundaround the magnetizer and having a passage inside, the passage having anoutlet and an inlet, and the electrically conducting pipe having acurrent input portion and a current output portion.
 2. The magneticfield generating structure according to claim 1, further comprising athermal conductive adhesive in thermal contact with the magnetizer andthe electrically conducting pipe.
 3. The magnetic field generatingstructure according to claim 1, further comprising at least two fluidpipelines, one of the at least two fluid pipelines being connected tothe outlet of the electrically conducting pipe, and the other fluidpipeline being connected to the inlet of the electrically conductingpipe.
 4. The magnetic field generating structure according to claim 3,further comprising two insulating pipes, the outlet and the inlet of theelectrically conducting pipe being respectively connected to the twofluid pipelines through the two insulating pipes.
 5. The magnetic fieldgenerating structure according to claim 1, further comprising at leasttwo fluid pipelines and a cooling system, one of the at least two fluidpipelines being connected to the outlet of the electrically conductingpipe and the other one of the at least two fluid pipelines beingconnected to the inlet of the electrically conducting pipe, and thecooling system being connected to the two of the at least two fluidpipelines.
 6. The magnetic field generating structure according to claim1, further comprising a power supply system electrically connected tothe current input portion and the current output portion of theelectrically conducting pipe.